U.S. imports of Parts for Central Heating Boilers (HS 840390) totaled $11.0M in August 2026, imported from 42 countries.
Importers of Parts for Central Heating Boilers paid $1.1M in duties in August 2026, an average duty rate of 10.24% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Parts for Central Heating Boilers imports of $11.0M in August 2026 ran 13% above the year-to-date monthly average of $9.8M.
Last updated: August 2026 dataSouth Korea leads US imports of central heating boiler parts, followed by China and France, reflecting the concentration of boiler manufacturing expertise in those markets. All imports enter under a single 10-digit line, 8403900000, which simplifies classification but means any part — from heat exchangers to burner assemblies — must be confirmed as specifically designed for central heating boilers rather than steam-generating or industrial boilers. Importers sourcing from China should note that these goods may be subject to Section 301 tariffs, making origin documentation and first-sale valuation strategies particularly relevant.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
521 import shipments a month
The key distinction is the boiler type the part is designed for: heading 8403 covers parts for hot-water central heating boilers (typically residential or commercial hydronic systems), while heading 8402 covers steam or vapor-generating boilers used in industrial or power-generation contexts. If a part is interchangeable between both types, classification generally follows the principal use or the boiler it is presented with.
Yes. Imports from China in this category are generally subject to Section 301 tariffs. Importers should verify the current tariff treatment with a licensed customs broker, as rates and product exclusions can change.
ImportsExports
Imports
$11.0MYoY · free account
Exports
$1.9MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $117.3M of Parts for Central Heating Boilers and exported $24.8M.
Through August 2026. Source: U.S. Census Bureau.
Subheading 2 of 2 in heading 8403
Subheading 840390 · $11.0M of $34.0M
Trade Directory
List your company under HS 840390 — Parts for Central Heating Boilers, so the companies trading it can find you. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8403900000 | Parts for Central Heating Boilers | $11.0M | 10.24% | 83.53% | $1.1M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8403900000 | Parts for Central Heating Boilers | $1.9M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · August 2026
origin
China pays 19.8% duty; Canada 0.7%.
customs district
destination
entry
rate provision · imports
16.5% enters free of duty; duty collected equals 10.24% of imports for consumption.